Early CZ75's had a baked epoxy pain finish. The polycoats are a plastic based spray on...a little better than paint.
Something like Industrial TEFLON-S will enhance the firearm by ending rust and corrosion and being self lubricating. No Oil = nothing to trap and collect dust and airborne contamination like dust.
Take a look at www.bearcoat.com
shy of hard-chrome, the toughest finish on the market.
Beat out caramic and poly coats in testing for the new FBI rifles from HS Precision. ALL the others failed the field testing for performance.